Check for continuity across the gas valve solenoid terminals. If you get a continutiy reading, inspect the area around the orifice cap to see if there's a deposit of dust blocking the orifice opening. If the area is clean, you'll need to replace the gas valve.

You can buy one at any Norcold authorized servicer(most RV dealerships).

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Since the coil is open, the gas valve needs to be replaced. The AC failure to function is either an open heater element in the exhaust flue, or a faulty control board.For more helpful information, go to www.thetford.com, and choose your model for downloadable manuals. If your model is'nt on their list, call the customer service department at(NNN) NNN-NNNN